Each plan is different so you will have to check each one. Remember that the redemption rate varies (a lot) between plans, so a mile is not a mile (for example AAdvantage mile is generally worth 2x QFF mile, but not always), so optimization is even more complex. Generally AAdvantage is the best plan, to get you started Earning on AAdvantage for L class is:

QF 50% miles, 100% status
LA 100% miles, 100% status
BA 25% miles, 100% status
CX 0% miles, 0 status

So you can see there is quite a bit of a difference. The CX plan (Asiamiles) might be good for a single L RTW ticket accrual, but it all depends on the split. But don't expect any FF plan to earn much for this type of ticket, it is much less than for A/D earning (making the FF plan choice not so important, after all).